An Efficient Filtering Technique of Gap Filler System for Multi-standards Digital Terrestrial TV in an SFN

Abstract

This paper presents and describes an efficient technique for canceling echoes and isolating the receiving and transmitting antennas for all generations of Digital Terrestrial Television (DTT) System in a Single Frequency Network (SFN) using the same input and output channel. We aim to improve the intelligibility of the essential parameters of DTT gap filer (GF) systems, especially the Modulation error ratio (MER), by canceling out echoes with optimizing coverage areas. We propose an efficient Filtering Technique EFT of GF with two echoes canceling, surface acoustic wave (SAW) filter, and LTE filter by applying as much echo window as necessary, including an echo window as small as possible. The EFT of GF provides and manages several echo windows that can be configured independently. We consider this filtering technique as the best echo canceller is existing, allowing the cancellation of high echo levels, perfect isolation antennas with an optimum output MER. It outperforms current techniques with complete echo cancellation accompanying improvement percentage, which varies between 7% and 39%.